Determine the number of significant figures for each. a) 65.74 b) 60.009 c) 66_ d) 65.750

a) 65.74 = 4 significant figures

b) 60.009 = 5 significant figures

c) 66_ = 2 significant figures

d) 65.750 = 5 significant figures

Explanation:

Significant figures or digits is defined as the total number of digits in a number that have meaning and contribute to the precision of the given number.    

a) 65.74 = 4 significant figures, all the non-zero figures are considered significant.

b) 60.009 = 5 significant figures, zeros present between non-zero figures are significant.

c) 66_ = 2 significant figures, all the non-zero figures are considered significant.

d) 65.750 = 5 significant figures, all the non-zero figures and the trailing zero after the decimal are significant.                                      

fe 55.85 g/mol and h2o 18.02 g/mol.